I am currently using a Samsung s8 on a post-paid unlimited plan. I would like to upgrade to a s10e. I would prefer the Verizon version over the unlocked version to ensure that all of the advanced features work. Best buy online is offering the Verizon 128gb s10e for $550 if I activate today and $450 if I activate later. I would have thought it would be the other way around. If I order the unactivated version, will Verizon charge me an upgrade fee to change over? Does it matter if I use the new sim that comes with my phone vs using the sim from my old phone.